题目内容
用波长为λ的单色光照射狭缝，得到单缝的夫琅禾费衍射图样，第3级暗纹位于屏上的P处，若将狭缝宽度缩小一半，那么P处变为明纹。
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波长λ＝600 nm的单色光垂直照射到牛顿环装置上，第二个明环与第五个明环所对应的空气膜厚度之差为____________nm．(1 nm=10-9 m)
Choose the appropriate combined adjectives to complete the following sentences according to the Chinese meaning. You can use the knowledge you have learned in the mini-lecture. （填入所选答案的大写字母）A. 2.5-micrometerB. long-rangeC. long-termD. water-borneE. water-needyF. energy-savingG. water-transferH. week-longI. hoped-forJ. moon-shot(1) During a ____1_____（为期一周的）trip to China in January this year, ...(2)The value of China’s ______2________（节能的）and environmental industries.(3)With concentrations of _____3_______(2.5微米）particles that were 20times the level considered safe by the WHO.(4) I suspect that this was the ______4______(期望的）intent when....(5) If the _____5______(长期的）result is that ....(6) building cross-continent _____6________（输水的）aqueducts....(7) it would be in the ______7_______（长期的）interest of humanity....(8) that was one month before this famous _____8______（登月）speech.(9)there are many ______9_________（饮水传染的）diseased that people die of.(10) The Ministry of Water Resources reported in 2002 that nearly two-thirds of China’s cities are “______10 ____”（缺水的）....
下列哪一项不属于桥梁总体规划设计的基本内容。()。
桥梁纵断面设计主要确定( )。
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